Technological advances enable the Michelson interferometer to measure multilayered samples that are tens of millimeters thick, with submicron accuracy.SAM MARGOLIS AND MICHAEL HOUK, BRISTOL INSTRUMENTS INC.White light interferometry (WLI) is a common system of measurement with a long history and a variety of applications, which currently include surface profiling1, medical imaging, and — as in the past — thickness measurement. Also known as coherence scanning interferometry (CSI),...Read full articleRelated content from Photonics MediaARTICLESMeasuring Optics with Spectrally Controlled InterferometryMeasuring flat and prismatic optics with a traditional laser interferometer is difficult to impossible. 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Any specific system being analyzed may, through the light it emits or reflects, communicate information about...Photonics HandbookInterferometry: Measuring with Light: Long applied to optical shop testing, interferometry is now used to measure many different types of parts in a variety of applications, such as optical system performance, surface roughness, surface form, and displacement of moving surfaces.An interferometer is an instrument that compares the position or surface structure of two objects. The basic two-beam division of amplitude interferometer components consists of a light source, a...Photonics HandbookAspheric Lenses: Design Considerations: This first of two articles will cover design and manufacturing options for aspheres; the second will include more detail on manufacturing and testing processes. 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For example,...Photonics HandbookPHOTONICS BUYERS' GUIDE CATEGORIESSuperluminescent Light-Emitting Diodes (LEDs)A superluminescent light-emitting diode is an emitter based on stimulated emission with amplification but insufficient feedback for oscillation to build up.Optical Coherence Tomography Imaging SystemsAn optical coherence tomography imaging system is a medical diagnosis technique that uses lightwaves to form cross-sectional images of a patient's retina.Laser Speckle InterferometersSurface ProfilersCOMPANIESBristol Instruments Inc.Bristol Instruments, Inc. designs, manufactures, and markets precision optical interferometer-based instruments for the scientific, fiber communications, and optical metrology markets. Its flagship...Photonics Buyers' GuideInnolume GmbHInnolume has a complete integrated solution for fabrication of a broad assortment of GaAs-based optoelectronic devices in the wavelength range of 780 to 1330 nm. Two production scale MBE...Photonics Buyers' GuideFermionics Opto-TechnologyFermionics Opto-Technology is an independent manufacturer of InGaAs photodiodes for data, voice, and video communications; large-area photodiodes for instrumentation and sensing applications; optical...Photonics Buyers' GuideArden Photonics Ltd.ARDEN PHOTONICS designs and manufactures a wide range of high quality components and instrumentation for the measurement of a wide range of properties of optical fibers and lasers ideally suited to...Photonics Buyers' Guide